Rename all methods accessing Singleton<T> as GetInstance().

app/surface/io_surface_support_mac.cc

Index: app/surface/io_surface_support_mac.cc
diff --git a/app/surface/io_surface_support_mac.cc b/app/surface/io_surface_support_mac.cc
index b27a5448ab93bbeb2879759f0868536a122d008e..28eb18acd7c0663be2b181d8e61536d45e651961 100644
--- a/app/surface/io_surface_support_mac.cc
+++ b/app/surface/io_surface_support_mac.cc
@@ -26,7 +26,7 @@ typedef CGLError (*CGLTexImageIOSurface2DProcPtr)(CGLContextObj ctx,
 
 class IOSurfaceSupportImpl : public IOSurfaceSupport {
  public:
-  static IOSurfaceSupportImpl* Initialize();
+  static IOSurfaceSupportImpl* GetInstance();
 
   bool InitializedSuccessfully() {
     return initialized_successfully_;
@@ -80,7 +80,7 @@ class IOSurfaceSupportImpl : public IOSurfaceSupport {
   DISALLOW_COPY_AND_ASSIGN(IOSurfaceSupportImpl);
 };
 
-IOSurfaceSupportImpl* IOSurfaceSupportImpl::Initialize() {
+IOSurfaceSupportImpl* IOSurfaceSupportImpl::GetInstance() {
   IOSurfaceSupportImpl* impl = Singleton<IOSurfaceSupportImpl>::get();
   if (impl->InitializedSuccessfully())
     return impl;
@@ -259,7 +259,7 @@ IOSurfaceSupportImpl::~IOSurfaceSupportImpl() {
 }
 
 IOSurfaceSupport* IOSurfaceSupport::Initialize() {
-  return IOSurfaceSupportImpl::Initialize();
+  return IOSurfaceSupportImpl::GetInstance();
 }
 
 IOSurfaceSupport::IOSurfaceSupport() {